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https://www.amazon.com/REMINGTON-EXPRESS-SHOTGUN-SLING-SHELLS/dp/B06WD322N4/ref=sr_1_3?s=sporting-goods&ie=UTF8&qid=1511647372&sr=1-3&keywords=Remington+870+Express+sling
Edward, the rear sling attaches to the sling ring on top of the pistol grip. Picture here : https://www.google.com/search?q=pistol+grip+Remington+870+Express+Pump+Action+Shotgun+12+Gauge&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiBkrbL3drXAhVGMd8KHcukBtsQ_AUIDCgD&biw=1280&bih=620#imgrc=SN_bcQZugnEWsM:
You would need to drill swivel in. This is the product most use for this. https://www.budsgunshop.com/catalog/product_info.php/products_id/714005163/U%2FM+SLING+TACTICAL+W%2FSWIVELS+BLK Video - https://www.youtube.com/watch?v=aLC3yXKhVRs
If you need a rear swivel mount this is a drop in replaceable pistol grip : https://shop.opticsplanet.com/blackhawk-knoxx-breachersgrip-gen-iii.html?_iv_code=BW-GGR-BGRP-K38702-C&utm_source=google&utm_medium=cpc&utm_campaign=plusbox-beta&gclid=EAIaIQobChMIt6eOheDa1wIVglYNCh3DMA3_EAQYAiABEgKyj_D_BwE